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An imaging observation of SN 1987A at gamma-ray energies
Cook, W. R.; Palmer, D. M.; Prince, T. A.; Schindler, S. M.; Starr, C. H.; Stone, E. C.
AA(California Institute of Technology, Pasadena), AB(California Institute of Technology, Pasadena), AC(California Institute of Technology, Pasadena), AD(California Institute of Technology, Pasadena), AE(California Institute of Technology, Pasadena)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. L87-L90. (ApJL Homepage)
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NASA/STI Keywords:
Balloon-Borne Instruments, Gamma Ray Astronomy, Imaging Techniques, Supernova 1987a, Astronomical Maps, Gamma Ray Telescopes, Monte Carlo Method
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The Caltech imaging gamma-ray telescope was launched by balloon from Alice Springs, Australia for observations of SN 1987A during November 1987. The preliminary results presented here are derived from 8200 s of instrument live time on the supernova and 2500 s on the Crab Nebula and pulsar at a float altitude of 36 km. Images of the SN 1987A region at gamma-ray energies confirming that the bulk of the gamma-ray emission comes from the supernova and not from LMC X-1. These flux measurements are compared to recent predictions concerning the distribution of Co-56 in the supernova ejecta. The data are consistent with models invoking moderate mixing of core material into the envelope.

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